Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 ce1d3b3e25fe04d6…

MALICIOUS

Office (OOXML) / .XLSX

723.7 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-02-24
MD5: ad21005195136669af3a644f73e7197f SHA-1: f046c81d878577f46175d9ca39c054ff163ef5ea SHA-256: ce1d3b3e25fe04d6c8a26b3b0dff5960e987700f9df545e43c0871b5f821ee98
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an OOXML document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the stream size, strongly suggesting it's a disguised executable or script. The document body presents a fake purchase order, likely a lure to encourage opening the embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/bo0.Fi contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
7426a805040282b17e67078ad079a7452a8e4f4c94e14b199ef9f82ce7728ea2		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/bo0.Fi 1047552 bytes
ooxml_oleobject_00_ole10native_00.bin
33374acb94327a96269ec7e5b95bf452cf3aca10e98f07148ac6b5513b332f0d		 ole-package OOXML xl/embeddings/bo0.Fi Ole10Native stream: Ole10NaTIVe 1037061 bytes

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